cantankerous -
Bad-tempered, argumentative, and uncooperative
The constant arguing of the cantankerous couple living above Ann always kept her up at night.
noun
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maniac -
Someone who is mentally ill tending towards violent and dangerous behavior.
The film’s villain was portrayed as a ruthless maniac with no regard for human life.
noun
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crank -
Someone who others think has unusual ideas or behaves strangely
Bill was seen as crank by his friends, because of the way he always spoke of the dangers of eating meat and being vaccinated.
adjective
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zany -
Amusingly unconventional and different
Einstein was unique among geniuses in that he also had a silly and zany side of his personality.
noun
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crackpot -
A slightly strange or foolish person
Wearing mismatched clothing and yelling to nobody in particular, the crackpot was amusing and ignored by the people who passed him by.
adjective
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loony -
Crazy or silly
The patients in the mental hospital could be described as loony, but the doctors tried to treat them as normal human beings with normal problems in order to try to help them get better.
adjective
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delusional -
Seeing or believing things that are not real
Betty was confident that she would be a millionaire by the time she would be 25, but her friends thought she was delusional.
adjective
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wacky -
Something that is strange and different to the point of amusement.
George’s grandmother was well known and loved for her wacky taste in shoes.
adjective
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delirious -
In a disturbed state of mind, often due to illness or fever, leading to confusion and hallucinations.
After three sleepless nights, he was delirious and barely able to speak clearly.
noun
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psycho -
A person with severe mental health issues, often describing someone who behaves in an erratic or dangerous manner.
She accused him of being a psycho and told him to leave after he repeatedly showed up uninvited and acted innappropriately.
adjective
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unhinged -
Mentally unbalanced and unstable
Trevor crossed the street when he saw the unhinged person yelling at him.
noun
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lunatic -
A person who is crazy
Martha was a defensive driver, to be safer with regards to a possible lunatic behind the wheel of another car.
